I have the Tyros 3 and Motif XF6. They work extremely well together. The combination of the T3 acoustic voices (Sax, Trumpet,Strings, Flute,etc) really match well with the Motif drums, bass, Pads, Synths. Plus the nearly 8,000 intelligent arpeggios are a joy to work with and allow you to create an infinite number of combinations. Plus the Piano is much better on Motif. Here's a few samples of my recordings using both:

http://www.box.com/s/tbl7myn6mmv05cnk5xfm

http://www.box.com/s/gc4p2frx9vt0f4o5ge8l

http://www.box.com/s/6l7ku8i7pczij4tq1bjp

One important fact. I do not multi-track. These were all recorded live to audio. So this combination of keyboards works great for live play.